HKIMO 2020 Grade 5 National Final (Heat) Set 01 Question 22

There are 8 Grade 5 classes in a primary school. What is the smallest number of Grade 5 students that guarantees at least 41 students in the same class?

Source glossary (English–Vietnamese): At least: ít nhất; Ensure: chắc chắn; Exist: tồn tại.